7. Two bulbs of 60W each and two coolers of 200W each, work on an average 4hrs a day. If the
energy costs 3.50 kWh, calculate monthly bill and the minimum fuse rating when power
is supplied at 200V.
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the study of and knowledge about the physical world and natural laws
भौतिक जगत और प्रकृति के नियमों का अध्ययन और ज्ञान; विज्ञान